I am replacing an old light that was above my sink and the box was so brittle it broke and I could not mount the new light. I removed the "new work" box and the drywall around it crumbled. Now the hole is too large for a new work box. Any ways to fix this? Really hoping I do not have to have someone come and repair a large section of drywall in my ceiling. Thank you
It looks like there's a joist running alongside the hole, as I would expect. Your box should be mounted to that and not really have anything to do with the drywall. Mix a little mud up, probably a thicker consistency for the ceiling, and mash it around the edges to fill in the gaps after the box is installed.
And honestly, your new light is likely to cover up the edges of that hole anyway so I wouldn't even bother patching it.
They make a octagon box ,that has a bracket to mount to the box. Also code states ,only a 1/8 gap may only be around box . Fix the drywall around box, and look for a light with a bigger mounting base. The base will help cover the repair ,if it does not blend in well